FXAIX vs XLE: 4% overlap
Fidelity 500 Index and Energy Select Sector SPDR Fund share 3.6% of their portfolios by weight — computed as Σ min(wA, wB) over every holding both funds own.
Different holding dates. These holdings were published about 5 months apart — FXAIX as of 2026-02-28, the rest through 2026-07-23. Each fund is compared using its most recent file, so any trading in between shows up as a difference.
You would hold two tickers and get the diversification of 2.0. Two funds that shared nothing would score 2.0; two identical funds score 1.0.
Top shared holdings
FXAIX and XLE hold 22 of the same securities. The ten contributing most to the overlap figure:
| Holding | in FXAIX | in XLE | Δ |
|---|---|---|---|
| XOM | 1.1% | 20.8% | 19.8% |
| CVX | 0.6% | 15.1% | 14.5% |
| COP | 0.2% | 6.1% | 5.8% |
| WMB | 0.2% | 4.1% | 3.9% |
| CASH | 0.3% | 0.1% | 0.2% |
| SLB | 0.1% | 4.1% | 4.0% |
| EOG | 0.1% | 4.5% | 4.4% |
| KMI | 0.1% | 4.0% | 3.9% |
| BKR | 0.1% | 3.5% | 3.4% |
| VLO | 0.1% | 4.6% | 4.5% |
Where FXAIX and XLE differ
Sector weights as a share of each fund, ordered by the size of the gap rather than the size of the sector — two funds that overlap heavily still usually diverge somewhere.
| Sector | FXAIX | XLE | Δ |
|---|---|---|---|
| Energy | 3.4% | 99.8% | −96.4pp |
| Information Technology | 31.8% | 0.0% | +31.8pp |
| Financials | 12.0% | 0.0% | +12.0pp |
| Communication Services | 10.5% | 0.0% | +10.5pp |
| Consumer Discretionary | 9.7% | 0.0% | +9.7pp |
| Health Care | 9.6% | 0.0% | +9.6pp |
| Industrials | 8.3% | 0.0% | +8.3pp |
| Consumer Staples | 5.4% | 0.0% | +5.4pp |
Δ is FXAIX minus XLE, in percentage points. Sector data is not published by every issuer, so “Unclassified” is a real category rather than a gap in the table.
What each fund holds alone
96.4% of FXAIX by weight, held in no part of XLE.
0.0% of XLE by weight, held in no part of FXAIX.
A large count with a small weight is the usual shape: the positions one fund adds are typically its smallest ones.
Concentration and cost
| FXAIX | XLE | |
|---|---|---|
| Top 10 holdings | 36.4% | 73.1% |
| Positions held | 506 | 23 |
| Cost per $10,000 held, per year | $1 | $8 |
Cost is the expense ratio applied to $10,000; it excludes any brokerage commission, bid-ask spread or tax consequence. Figures are facts about the funds, not a suggestion about which to hold.
Frequently asked
How much do FXAIX and XLE overlap?
FXAIX and XLE overlap 3.6% by portfolio weight — largely distinct portfolios. They share 22 holdings. The figure comes from current issuer holdings files (FXAIX as of 2026-02-28, XLE as of 2026-07-23).
How is the overlap between FXAIX and XLE calculated?
As the sum of the smaller weight in each fund, over every holding both funds own: Σ min(wA, wB). If FXAIX holds a stock at 6% and XLE holds the same stock at 4%, 4% counts as shared. The result is bounded between 0% and 100%, and it is computed after looking through any fund-of-funds to the underlying holdings.
Is it redundant to hold both FXAIX and XLE?
That depends on your goals — we state facts, not advice. At 3.6% overlap, each fund still contributes meaningfully distinct exposure.
What does FXAIX own that XLE doesn't?
FXAIX holds 506 positions and XLE holds 23; 483 of FXAIX's positions don't appear in XLE at all, and they are 96.4% of FXAIX by weight.
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Related comparisons
Sources: issuer holdings files, FXAIX as of 2026-02-28, XLE as of 2026-07-23. Weights are fractions of each fund. Diagnostics, not advice.